How to Deal With Dollar Spot Fungus in Ohio & Michigan

Safeguard Your Grass From This Lawn Disease

Tan-colored, bleached circles suddenly popping up throughout your yard? The likely culprit is dollar spot fungus. It’s a common lawn disease that ruins your grass’s appearance.

More resources get invested in fighting this single turf problem than any other fungal issue. It’s remarkably widespread and incredibly frustrating to handle. But don’t worry! Let the professionals at NexGreen explain what’s genuinely occurring to your lawn and what realistic steps you can take to address it.

What Is Dollar Spot Fungus? 

Dollar spot comes from a fungal pathogen called Clarireedia jacksonii. This specific disease attacks your grass’s leaf blades instead of the roots or crowns, which is actually positive news. It means your lawn has the potential to bounce back with proper care.

The name “dollar spot” originates from how the damage appears on mowed turf. You’ll observe circular, silver dollar-sized spots (1 to 2 inches in diameter) that develop a bleached tan color. These separate spots can blend together into larger, straw-colored patches that genuinely thin your grass and allow weeds to move in.

Dollar spot is one of the most common lawn fungus diseases. It targets cool-season types like Kentucky bluegrass, fescues, and perennial ryegrass. But it’s equally willing to wreck warm-season varieties like Bermuda and zoysia, too. So if you have a lawn, you’re potentially at risk. 

Typical Factors Causing Dollar Spot 

Thatch buildup and soil compaction. Less air and water penetration creates that dry-soil-but-moist-canopy situation dollar spot loves.

Poor air circulation. Dense shrubs, low tree branches, and excessive shade trap moisture, encouraging lawn diseases to flourish.

Afternoon or evening irrigation. Watering during these hours keeps grass blades damp for way too long.

Low nitrogen levels. Lawns that are under-fertilized are sitting ducks because the grass isn’t growing well enough to outgrow the infection.

Mowing stress. Cutting your grass too short, with dull blades, or scalping the lawn weakens grass and makes fungal invasion much easier.

What Does Dollar Spot Look Like? 

The most obvious sign that you’re dealing with dollar spot is those telltale patches: small, straw-colored, or bleached spots about the size of a silver dollar. Upon closer examination, you’ll spot tan lesions running across the blade in an hourglass pattern. They’re outlined with a reddish-brown border.

Another clue you’re dealing with this specific fungus? White, cobweb-like material on grass during dewy mornings. That’s the mycelium becoming visible when the grass is wet. As sunshine appears and the blades dry out, it disappears. In other words, you could easily miss it if you’re not looking early.

Usual Timing & Favorite Locations 

Dollar spot really thrives in its particular weather window, especially temperatures between 60°F and 90°F. Add humid days and cool, dewy nights to the mix, and you’ve got perfect conditions. So you typically see it from late spring through early fall in Ohio and Michigan. Outbreaks usually peak in late summer when all those environmental factors line up just right.

This lawn fungus absolutely loves prolonged moisture sitting on grass blades combined with depleted nitrogen levels in the soil. If you’re watering your lawn and that water only dampens the leaf surfaces (instead of soaking deep into the root zone), you’re creating exactly the conditions this fungus craves.

Dollar spot spreads primarily through mycelium, or fungal threads, on previously infected plants. The most effective carriers? Grass clippings. Even walking around your yard after mowing can distribute it throughout your property.

It survives winter as structures called pseudosclerotia, hidden in dead plant debris. When temperatures start rising in spring, those structures reactivate and the whole cycle begins again. In most areas, the pattern runs from early May straight through the end of October.

10 Steps to Combat This Lawn Fungus 

Let Your Soil to Breathe

Lawn aeration reduces compaction and improves water and nutrient penetration. Without it, the elements your grass needs to thrive simply can’t reach where your grass can actually use them.

Also, if your thatch layer exceeds half an inch, it’s time to dethatch for better airflow and drainage. You don’t want anything blocking water and nutrients from reaching the roots where they’re needed most.

Feed Your Lawn Nitrogen

Give your grass a boost with slow-release nitrogen fertilizer during late spring to help it grow strong through early summer, when dollar spot outbreaks often start. Continue with light, regular nitrogen applications throughout the growing season at rates recommended for your specific grass type.

Healthy, well-fed grass can actually outgrow the disease. Undernourished lawns? They struggle to recover and just keep getting worse and worse.

Change Your Watering Schedule

This may not seem like a big deal, but trust us—it really is. Water deeply but infrequently, aiming for about 1 inch per week, in the early morning hours (between 5 and 10 a.m.).

Watering at this time gives the soil time to soak up moisture, allowing the grass blades to dry quickly as the sun comes up. Remember, you want moisture in the root zone, not sitting on leaves.

And be sure to stop those shallow sprinklings in the evening. Sure, sometimes that’s the only time you’re home to turn on the sprinkler. But you’re basically rolling out the welcome mat for dollar spot.

Adjust Your Mowing Height

Taller grass blades shade the soil, retain better moisture in the root zone, and create an environment less favorable for the fungus. Plus, taller grass is just healthier and more resilient overall.

Important: Never remove more than one-third of the grass blade height in a single mowing. And be sure to keep your mower blades sharp. Dull blades tear grass instead of cutting cleanly, and those ragged edges are more susceptible to infection.

Stop the Spread

When you have active dollar spot, you don’t want to help it spread around. Instead of mulching the grass clippings back into the lawn, bag or collect those from infected areas. Clean your mower deck and tools after use, especially if you’re moving from an infected area to a healthy one.

Do Remove the Dew

If you’re really serious about prevention, mow early in the morning to remove dew-covered grass tips. On larger properties, some people even drag a hose or rope across the lawn to knock dew off the blades or roll something lightweight across the yard to soak up the dew. These techniques may sound simple, but they work.

Opt for a Fungicide Treatment

By far, the two best fungicides for dollar spot fungus are chlorothalonil and propiconazole. Here’s what lawn care professionals know but most homeowners don’t: You can’t just spray the same fungicide over and over. The fungus adapts to it. So if you want control in the long run, rotation is key! Usually, you’ll reapply every 14 to 28 days during high-risk times of the year.

Improve Access to Air and Sunlight

Prune low tree branches and thick shrubs that shade your lawn and can foster a moist atmosphere over the grass. Improved air circulation prompts dew and irrigation to dry more quickly, breaking the ideal conditions for fungus.

Get the Right Grass

When it’s time for overseeding or a lawn renovation, pick a variety of grass that has more resistance to dollar spot disease. Grass isn’t all the same. Some have been bred to resist common lawn diseases like this.

You should also figure out the proper type of grass for your region. If you’re battling your climate, trying to grow cool-season grass in a warm region or vice versa, then you’re just making everything more difficult than it should be. Match your turfgrass choice to your geographic location, your soil, landscape, and how you actually use your lawn.

Contact NexGreen

When you have a lawn fungus overtaking your yard, hiring a professional lawn care company will definitely pay off over the course of time. It will save you time, money, and headaches, since we know exactly what products to use, when to apply them, and how often to rotate them.

FAQS About Dollar Spot 

Is fungicide always necessary?

If you catch dollar spot fungus early and adjust your maintenance practices accordingly, you can often suppress the disease without reaching for chemicals. However, if it sticks around, a fungicide application may be required.

What is the best fungicide for dollar spot in Michigan and Ohio?

Chlorothalonil and propiconazole are two of the best options. Just be sure to rotate them to help avoid resistance.

Will my lawn actually recover from this lawn fungus?

Yes! Since dollar spot attacks the leaf blades and not the roots or crowns, your lawn can absolutely bounce back. Most lawns will be showing visible improvement within 2 to 4 weeks after you implement control measures, add proper nitrogen, and maintain the appropriate mowing height.

Will dollar spot go away on its own?

Not usually. Active treatment will help limit the spread. To prevent it from coming back, try to maintain nitrogen levels, water early in the morning, mow high, and reduce thatch buildup.

Trust the Lawn Care Experts in Ohio & Michigan!

DIY attempts to prevent and eliminate lawn diseases often fall short. When you want to eradicate dollar spot (and other lawn care diseases), contact the experts at NexGreen. We offer pest control and lawn care services in Ohio communities around the areas of Westerville, Columbus, and Groveport, OH. 

We also provide pest control and lawn care services in Michigan for areas near Sterling Heights, Rochester Mills, and Waterford, MI.